/* Calculator-only accessibility and print switches */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.print-only {
  display: none;
}

/* Page heading and workspace */

.calculator-heading {
  padding-block: var(--space-6);
}

.calculator-heading h1 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(2.2rem, 7vw, 4.25rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.calculator-heading__lede {
  max-width: 45rem;
  margin-block: var(--space-4) var(--space-2);
  color: var(--color-muted);
  font-size: 1.2rem;
}

.calculator-heading__note {
  max-width: 45rem;
  margin: 0;
  font-weight: 700;
}

.calculator-workspace {
  padding-block: var(--space-5) var(--space-7);
}

.calculator-layout {
  display: grid;
  gap: var(--space-5);
  align-items: start;
}

.calculator-form-panel,
.calculator-results-panel,
.recent-calculations {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.calculator-form-panel > h2,
.calculator-results-panel > h2,
.recent-calculations > h2 {
  margin-top: 0;
  line-height: 1.2;
}

.calculator-form {
  display: grid;
  gap: var(--space-5);
  counter-reset: form-step;
}

/* Form structure */

.form-section {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
  counter-increment: form-step;
}

/* A hairline separates steps without introducing nested fieldset boxes. */
.form-section + .form-section {
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.form-section legend {
  padding-inline: 0;
  font-size: 1.05rem;
  font-weight: 800;
}

/* Only direct legends receive a step badge; repeated-group legends do not. */
.form-section > legend {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  margin-bottom: var(--space-3);
}

.form-section > legend::before {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  color: var(--color-on-brand);
  font-size: 0.85rem;
  font-weight: 800;
  line-height: 1;
  background: var(--color-brand);
  border-radius: 50%;
  content: counter(form-step);
}

.project-areas__list {
  display: grid;
  gap: var(--space-4);
}

/* Repeated area and room groups are the one inset surface within a form. */
.project-area {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface-muted);
}

.project-area > legend {
  padding-inline: var(--space-2);
  font-weight: 800;
}

.project-area__dimensions {
  display: grid;
  gap: var(--space-4);
}

.project-area__remove {
  justify-self: start;
  border-color: var(--color-border);
  color: var(--color-muted);
  background: var(--color-surface);
}

.project-areas__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.project-areas__actions .action-status {
  flex-basis: 100%;
}

.calculator-conditional-section {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
}

.calculator-conditional-section[hidden] {
  display: none;
}

.pattern-recommendation {
  margin: 0;
  font-weight: 750;
}

.form-section__description {
  margin: 0;
  color: var(--color-muted);
}

.field__hint,
.field__error {
  margin-block: var(--space-2) 0;
  font-size: 0.9rem;
}

.field__hint {
  color: var(--color-muted);
}

.field__error {
  color: var(--color-danger-ink);
  font-weight: 700;
}

[aria-invalid="true"] {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 2px var(--color-danger-ring);
}

.error-summary,
.result-warnings {
  padding: var(--space-4);
  border-left: 0.3rem solid var(--color-danger);
  background: var(--color-danger-surface);
}

.error-summary h3,
.result-warnings h3 {
  margin-top: 0;
}

.form-actions,
.result-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.button-secondary {
  border-color: var(--color-brand);
  color: var(--color-brand);
  background: var(--color-surface);
}

.result-summary {
  display: grid;
  gap: var(--space-3);
}

.result-card {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface-muted);
}

.result-card--primary {
  border-color: var(--color-brand);
  background: var(--color-brand-tint);
}

.result-card h3,
.result-card p {
  margin: 0;
}

.result-card .result-card__value {
  margin-block: var(--space-2);
  font-size: clamp(1.7rem, 5vw, 2.5rem);
  font-weight: 850;
  line-height: 1.1;
}

.result-card__description,
.result-metric__description {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.result-section,
.result-notes,
.result-warnings,
.result-actions {
  margin-top: var(--space-5);
}

.result-metrics {
  margin: 0;
}

.result-metric {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-1) var(--space-4);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.result-metric dt {
  font-weight: 650;
}

.result-metric dd {
  margin: 0;
  font-weight: 800;
  text-align: right;
}

.result-metric .result-metric__description {
  grid-column: 1 / -1;
  text-align: left;
}

.action-status:empty {
  display: none;
}

.action-status {
  flex-basis: 100%;
  margin: 0;
  color: var(--color-muted);
}

.recent-calculations {
  margin-top: var(--space-5);
}

.recent-calculations__privacy {
  color: var(--color-muted);
}

.recent-calculations__list {
  display: grid;
  gap: var(--space-3);
  padding: 0;
  list-style: none;
}

.recent-calculations__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.recent-calculations__remove {
  min-height: 2.5rem;
  padding: var(--space-2) var(--space-3);
  border-color: var(--color-border);
  color: var(--color-muted);
  background: var(--color-surface);
}

/* Supporting content */

.calculator-content {
  padding-block: var(--space-7);
}

.calculator-article {
  max-width: 52rem;
}

.calculator-article section {
  margin-block: var(--space-7);
}

.formula-block {
  max-width: 100%;
  padding: var(--space-4);
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface-code);
  line-height: 1.8;
}

.content-review {
  color: var(--color-muted);
  font-size: 0.92rem;
}

.faqs details {
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.faqs summary {
  font-weight: 750;
  cursor: pointer;
}

@media (min-width: 44rem) {
  /* Only the length/width pair sits side by side — its two labels are
     identical, so the inputs always align. Every other field stacks in a
     single column for reliable, tidy alignment. */
  .project-area__dimensions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 64rem) {
  .calculator-layout {
    grid-template-columns: minmax(0, 1fr) minmax(22rem, 0.85fr);
  }

  .calculator-results-panel {
    position: sticky;
    top: var(--space-4);
    max-height: calc(100vh - (2 * var(--space-4)));
    overflow-y: auto;
  }
}